In my case, it was connected to a TV to send sound to wireless Bluetooth speakers, but it turns on and off with the TV without being able to adjust it either from the TV menu, and it also changes the speaker setting every time, sending the maximum volume with the risk of damaging the speakers

The Bluetooth it has is 4.2 and no device can find it, I tried with the following devices: 2 PCs, 2 phones, and a pair of wireless headphones and NOTHING. It shows that it is pairing but nothing happens... The most useless thing I have ever bought. Only get it if you live in 2015.

Unfortunately, it is only a transmitter and does not receive a signal. Unfortunately, the return period had expired when I realized it, as I was out of Greece, and now I cannot replace it. What a pity.

Easy installation simple but very good operation. The only disadvantage is that it doesn't say when it's connected, you just start hearing sound. On a smart TV without Bluetooth that I used it on, it easily and cheaply solved the problem of hearing sound while walking on the treadmill and watching TV

If you want to connect headphones to your TV and it doesn't have the appropriate input, this is the only option. However, its price should be below 20 euros.

After almost 2 years of use, I can say that I am satisfied. It connected to the USB port on my Samsung TV, which does not have Bluetooth (and of course, no optical connection). I turn on the TV and within a few seconds, it is connected to the Sony headphones. There are no interferences within a distance of 6-7 meters without obstacles. If there is a wall in between, then there are interferences or the signal is lost. Also, there is a small and minimal audio delay, which someone can notice if they pay close attention to the speeches (maybe it only applies to my case though.......)

It is what it says. The quality of the sound depends, of course, on both the source (optical out from TV, DVD, BR, etc.) and the fidelity of your headphones. Easy installation and pairing. Bluetooth version 5.0 and support for Aptx, Aptx LL Qualcomm codecs. Definitely value for money.

Because I got fooled.
It only works as a transmitter. (Tx mode.)
You can't connect your stereo to the TV, etc.
The image I'm providing from a similar product explains the difference in connection.

Fast and easy connection, excellent sound quality. I have it on my TV and I use one of the USB ports of the TV for its power supply

One of the best Bluetooth transmitters... without noise it transmits audio from optical. I had bought small and cheap ones from well-known Chinese stores... but they had a lot of noise... so you couldn't hear the sound. It is one of the best... it connects automatically... I have it connected to the TV's optical out. It also requires power from a 5V USB.